Re: [Haskell-cafe] Rose Tree

Ryan Bloor:

Data Tree a = Empty | Leaf a | Node a [(Tree a)]

The Leaf constructor seems superfluous to me. Any (Leaf x) value is equivalent to (Node x []). So I rather just have data Tree a = Empty | Node a [Tree a] which will mean less work for your task of writing processing functions, too. Kalman ---------------------------------------------------------------------- Get a free email account with anti spam protection. http://www.bluebottle.com/tag/2